Master asynchronous programming in .NET with the Async Expert course. You will experience a deep dive from the basics to advanced techniques, such as async-await, working with concurrent collections, and managing parallelism.
The course includes homework assignments to consolidate knowledge as well as exclusive materials from recognized experts: Marc Gravell, Daniel Marbach, and Stephen Cleary.
Update: It was decided to also add the course C# 9.0 Professional to the collection.
Szymon Kulec is the co‑founder and a board member of Dotnetos Ltd. He shares his knowledge through blog posts, lectures, consulting work, and online courses.
He created the Polish course Master of Aggregates and co‑created Async Expert. He has delivered many talks on software development.
He helps companies, engineering teams, and individual developers cut software complexity and raise business value.
Łukasz Pyrzyk is a Microsoft MVP and the co-founder of Dotnetos. He has worked as a .NET Technical Lead at Sonova Group, Ryanair, Credit Suisse, and Volvo IT.
He works with .NET, C#, Azure, and backend systems. He focuses on microservices, performance tuning, and system optimization.
| # | Lesson Title | Duration | Access |
|---|---|---|---|
| 1 | Course overview Demo | 05:38 | |
| 2 | BenchmarkDotNet basics | 22:33 | |
| 3 | Demo: sharplab.io | 10:07 | |
| 4 | Demo: ConcurrencyVisualizer | 09:45 | |
| 5 | Demo: Parallel Stacks/Tasks | 08:10 | |
| 6 | Homework | 01:23 | |
| 7 | Threads | 01:42:37 | |
| 8 | ThreadPool | 01:37:50 | |
| 9 | Demo: ThreadPool use with different API | 20:27 | |
| 10 | Demo: ThreadPool.BindHandle usage | 19:36 | |
| 11 | Homework | 01:30 | |
| 12 | Task API | 01:16:11 | |
| 13 | Async-await foundations | 01:55:31 | |
| 14 | Async eliding | 19:59 | |
| 15 | ValueTask | 23:46 | |
| 16 | Task API and async | 27:37 | |
| 17 | Homework | 01:06 | |
| 18 | Execution, contexts, scheduler | 01:30:08 | |
| 19 | Sync vs async | 43:53 | |
| 20 | Fire and forget | 17:56 | |
| 21 | TaskCompletionSource | 24:45 | |
| 22 | Awaitables | 25:36 | |
| 23 | Locals | 37:31 | |
| 24 | Homework | 01:22 | |
| 25 | Tasks aggregations | 45:33 | |
| 26 | IAsyncDiposable | 17:39 | |
| 27 | IAsyncEnumerable | 15:01 | |
| 28 | Demo: gRPC with IAsyncEnumerable | 07:05 | |
| 29 | Demo: New SQL client | 03:34 | |
| 30 | Demo: Timeout with WhenAny and WhenAll | 05:34 | |
| 31 | Homework | 00:46 | |
| 32 | Hardware | 40:02 | |
| 33 | volatile | 15:41 | |
| 34 | Demo: Epoch programming in ConcurrentQueue | 15:09 | |
| 35 | Interlocked | 19:39 | |
| 36 | Demo: simple pool with Interlocked.Exchange | 03:54 | |
| 37 | Barriers and alignment | 09:36 | |
| 38 | Demo: range reservation with Aeron.NET and Interlocked.CompareExchange | 10:48 | |
| 39 | Homework | 01:08 | |
| 40 | Exclusive locking - part 1 | 24:13 | |
| 41 | Demo: decompiling lock | 06:17 | |
| 42 | Exclusive locking - part 2 | 09:57 | |
| 43 | Demo: non-blocking usage of Monitor.TryEnter | 07:35 | |
| 44 | Exclusive locking - part 03 | 08:21 | |
| 45 | Non-exclusive locking - part 1 | 11:07 | |
| 46 | Demo: task throttling with Task and SemaphoreSlim | 08:03 | |
| 47 | Non-exclusive locking - part 2 | 07:38 | |
| 48 | Demo: Building custom string pool with ReaderWriterLock | 12:10 | |
| 49 | Non-exclusive locking - part 3 | 06:09 | |
| 50 | Signalling | 13:20 | |
| 51 | Asynchronous primitives - part 1 | 05:51 | |
| 52 | Demo: AsyncLock implementation | 21:33 | |
| 53 | Asynchronous primitives - part 2 | 15:58 | |
| 54 | Homework | 01:10 | |
| 55 | Foundations | 20:52 | |
| 56 | BlockingCollection | 11:56 | |
| 57 | ConcurrentStack | 16:43 | |
| 58 | Demo: object cache with ConcurrentStack | 04:11 | |
| 59 | ConcurrentQueue | 22:24 | |
| 60 | Demo: memory pool in Kestrel ASP.NET with ConcurrentQueue | 07:39 | |
| 61 | ConcurrentDictionary | 17:08 | |
| 62 | Demo: efficient caching with ConcurrentDictionary.GetOrAdd | 04:01 | |
| 63 | ConcurrentBag | 06:18 | |
| 64 | Homework | 00:47 | |
| 65 | Introduction | 16:29 | |
| 66 | Pipelines | 26:22 | |
| 67 | Demo: TcpEcho | 18:29 | |
| 68 | Channels | 19:56 | |
| 69 | Demo: Usage of the Channel<T> in ASP.NET Core | 07:21 | |
| 70 | Homework | 01:03 | |
| 71 | IValueTaskSource with Interlocked.CompareExchange | 19:13 | |
| 72 | IValueTaskSource based on an array with token discriminator | 11:01 | |
| 73 | ValueTask and pooling in .NET 5 | 11:26 | |
| 74 | ManualResetValueTaskSourceCore | 11:33 | |
| 75 | False Sharing | 09:56 | |
| 76 | Demo: Hosted services with IHostBuilder, IHostedService and ConcurrentQueue | 13:19 | |
| 77 | F# async vs C# async | 29:14 | |
| 78 | What's new in CancellationTokens for .NET 5 and beyond | 13:11 | |
| 79 | Summary of the course | 14:03 | |
| 80 | Marc Gravell, webinar nr 1 | 01:25:05 | |
| 81 | Daniel Marbach, webinar nr 2 | 01:01:11 | |
| 82 | Steve Cleary, webinar nr 3 | 01:05:19 | |
| 83 | Daniel Marbach, webinar nr 4 | 01:08:21 | |
| 84 | Marc Gravell, webinar nr 5 | 01:05:40 | |
| 85 | Steve Cleary, webinar nr 6 | 01:20:20 | |
| 86 | Daniel Marbach, webinar nr 7 | 55:41 |
Get instant access to all 85 lessons in this course, plus thousands of other premium courses. One subscription, unlimited knowledge.
Learn more about subscription| # | Title |
|---|---|
| 1 | M01L01Overview |
| 2 | M01L02BenchmarkDotNet |
| 3 | M01L03Sharplab |
| 4 | M01L04ConcurrencyVisualizer |
| 5 | M01L06Homework |
| 6 | M02L01Introduction |
| 7 | M02L02Threads |
| 8 | M02L03ThreadsPools |
| 9 | M03L01TaskAPI |
| 10 | M03L02AsyncAwaitFoundations |
| 11 | M03L03AsyncEliding |
| 12 | M03L04ValueTask |
| 13 | M03L05TaskAPIandAsync |
| 14 | M03L06Homework |
| 15 | M04L01 |
| 16 | M04L02 |
| 17 | M04L03 |
| 18 | M04L04 |
| 19 | M04L05 |
| 20 | M04L06 |
| 21 | M04L07 |
| 22 | M05L01 |
| 23 | M05L02 |
| 24 | M05L03 |
| 25 | M05L04 |
| 26 | M06L01 |
| 27 | M06L02 |
| 28 | M06L03 |
| 29 | M06L04 |
| 30 | M06L05 |
| 31 | M07L01ExclusiveLocking |
| 32 | M07L02NonexclusiveLocking |
| 33 | M07L03Signalling |
| 34 | M07L04AsyncPrimitives |
| 35 | M07L05Homework |
| 36 | M08L01 |
| 37 | M08L02 |
| 38 | M08L03 |
| 39 | M08L04 |
| 40 | M09L04 |
| 41 | M09L03 |
| 42 | M09L02 |
| 43 | M09L01 |
| 44 | M10L01 |
| 45 | M10L02 |
| 46 | M10L03 |
| 47 | M10L04 |
| 48 | M10L05 |
| 49 | M10L07 |
| 50 | M10L08 |